期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 289, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120720
关键词
Electrochemical oxidation; Electrocatalytic membrane; Reduced TiO2 nanotube arrays; Sulfamethoxazole
资金
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA202012]
- Fundamental Research Funds for theCentral Universities
A reduced TiO2 nanotube arrays-based titanium membrane (RTNA/TM) was fabricated through a facile electrochemical method to enhance the electrocatalytic performance. The RTNA/TM showed high efficiency in sulfamethoxazole (SMX) removal and stable performances for multiple cycles, making it a promising flow-through anode for electrochemical oxidation.
The reduced TiO2 nanotube arrays (RTNA) electrode is a cost-effective anode, but its limited electrocatalytic activity is an obstacle for the application. To solve this problem, a reduced TiO2 nanotube arrays-based titanium membrane (RTNA/TM) was fabricated by a facile electrochemical method to promote the electrocatalytic performance. The one-dimensional nanostructure and reduction treatment increased the electrocatalytic capacity and reduced the energy consumption, resulting in the sulfamethoxazole (SMX) removal rate of 86.1% and electrical efficiency per order of 0.55 kWh/m(3) for RTNA/TM. Compared with the batch mode, the SMX removal efficiency of the flow-through mode was significantly increased by 71%, verifying the superiority of a porous flow-through anode. The SMX degradation performances of RTNA/TM were strongly affected by the fluid velocity, current density and initial SMX concentration, except for pH. Both hydroxyl radicals and direct electron transfer were responsible for the SMX removal, while the contribution of sulfate radicals could be ignored. Furthermore, RTNA/TM displayed stable performances for five experimental cycles and showed remarkable degradation efficiencies of SMX spiked into the natural water (76.5%) and wastewater effluent (75.4%). Therefore, RTNA/TM has been proven to be a promising flow-through anode for electrochemical oxidation.
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